Oblicz a1 oraz q ciągu geometrycznego w którym a4= 2 i a7= - 16
a₇=a₄q³
-16=2q³
q³=-16/2
q³=-8
q=-2
a₄=a₁q³
2=a₁×8
a₁=2/8=¼
a4 = 2 i a7 = -16
an = a1*q^(n-1)
a4 = a1*q³
a7 = a1*q⁶
a1*q³ = 2
a1*q⁶ = -16
a1q⁶/a1q³ = -16/2
q³ = -8
q³ = (-2)³
q = -2
====
2 = a1*(-2)³
-8a1 = 2 /:(-8)
a1 = -2/8
a1 = -1/4
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a₇=a₄q³
-16=2q³
q³=-16/2
q³=-8
q=-2
a₄=a₁q³
2=a₁×8
a₁=2/8=¼
a4 = 2 i a7 = -16
an = a1*q^(n-1)
a4 = a1*q³
a7 = a1*q⁶
a1*q³ = 2
a1*q⁶ = -16
a1q⁶/a1q³ = -16/2
q³ = -8
q³ = (-2)³
q = -2
====
a4 = a1*q³
2 = a1*(-2)³
-8a1 = 2 /:(-8)
a1 = -2/8
a1 = -1/4
======